My parents and I have taken I-75 every year since the summer of 1996 and we just took it this past August. We had no problems expect for a major accident in the Northbound lanes while driving South the day we arrived to Florida, which closed a long stretch of the Interstate on that side. Driving back home in Georgia a truck had flipped over, however we were lucky enough that it feel the right way so it did not cause a huge delay like we saw when driving South.
We also purchase Dave Hunter's Along The I-75 book, which has always helped us a lit. If you did not know he also has a new Florida Interstate book which is designed like the I-75 book, the difference it's only all the Florida Interstates exits and not just for I-75. Also because of that book the Along I-75 book is now released every 2 years and it's the same for the Florida book. Since the most recent I-75 book was released last year, that means the Florida Interstate book should already be for sale.